Fig. 1: Digonal ring closures for the synthesis of azetidines. | Nature Communications

Fig. 1: Digonal ring closures for the synthesis of azetidines.

From: A general synthesis of azetidines by copper-catalysed photoinduced anti-Baldwin radical cyclization of ynamides

Fig. 1

a Original and revised Baldwin’s rules for digonal ring closures. b Rare examples of radical 4-exo-dig and 5-endo-dig cyclizations. c Reaction design: radical 4-exo-dig cyclization of ynamides triggered by visible-light activation with a photoredox catalyst (PC). d Representative examples of naturally occurring/biologically relevant azetidines.

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